. >> dawn blake lives on the reservation located neuroeureka. she believes it's only a matter of time before the tox sibs in the water make those in the community sick. >> marijuana operations are potentially destroying the landscape. >> they're killing the animals, they're killing the forest and they don't care. >> hikers like rick fleming fear the water could affect them as well. because of the proximity of the growth sights to water sources. he's part of a nonprofit dedicated to cleaning up what growers are leaving behind. >> if we can go in there and safely pick it up and get it out, then great. >> it's a green rush. >> a green rush for marijuana instead of gold. and it affects our environment. >>> dianne feinstein sent a letter asking for help in fighting the damage caused by pop growers in the central valley. if you have a story for the investigative unit, call our tip line at 888-996 tips. or send an e-mail to the unit at nbc bay area.com. finally, you're invited to join us right here on nbc bay area. why? because we investigate. thanks f